“If the government does not give any feedback or does not release a final report of the survey, the respondents will think they participated _______," said the social scientist Hu.A.in no wayB.in vain C.without effortD.at a loss
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B解析in no way 决不；in vain枉费心机；徒劳无益；白费力气；without effort 轻松地; at a loss不知所措；困惑; in vain符合语境。